UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0

Steps to reproduce the problem:
1. Open any webapp with source mapped JS files (for example https://github.com/reactjs/redux/tree/master/examples/todos
React/Redux Application packed by webpack and babel)
2. Open DevTools
3. Open Seach Tool (by files) on Sources tab (Ctrl+Shift+F)
4. Try to find the substring, that is guaranteed to be present in source files mapped by source map tech
5. the matches could not be found
6. open taget sorce file in Source tab Navigator => Sources
7. Select file, contains the substring, already tryed to search
8. Try to find substring in file localy (Ctrl + F)
9. Thats OK

What is the expected behavior?
Target substring that is guaranteed to be present in source files mapped by source map tech, is present in search results, as it does for basic source files

What went wrong?
Search substring in sources as mapped by source map tech don't work

Did this work before? No 

Chrome version: 95c454326a7a3153e984e50a4719924968490717-refs/branch-heads/3112@{#744}  Channel: stable
OS Version: 10.0
Flash Version: 26.0.0.151
 

Deleted: Developer Tools.png 131 KB

	Developer Tools.png 131 KB View Download